Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 270359

Area Forecast Discussion
National Weather Service Salt Lake City UT
959 PM MDT Wed Apr 26 2017

.SYNOPSIS...A series of progressively colder systems will cross
the region through Saturday, with high pressure returning late in
the weekend.


.DISCUSSION...A moist, slightly cyclonic northwesterly flow aloft
has spread into the forecast area this evening with a strong jet
punching into the Great Basin. The shortwave disturbance associated
with the leading edge of this jet has pushed a shallow cold front
into western Utah, although a stronger push associated with the
700mb baroclinic zone remains upstream and is expected to shift into
Utah after midnight. Northwest winds should increase later tonight
into tomorrow morning with some gusty downslope winds in favored
areas such as northwest Utah and the eastern valleys.

Steadier rain associated with earlier warm advection is winding
down, although shower activity continues to develop in the cold
sector and will impact Utah through the rest of the evening, then
precipitation will become increasingly confined to the mountains and
upslope regions after midnight. Snow levels have begun to fall and
should reach 5000-6000 feet across the north and 6500-7500 feet
across the south before 12z. Although showers will become more
spotty later tonight, there will be a potential for some enhancement
off the Great Salt Lake.

Precipitation will decrease tomorrow but is not expected to
completely end as a moist northwest flow remains in place.

Updated the forecast to make minor updates several parameters but
mainly lowered snow levels a bit for the rest of the evening.


.AVIATION...Intermittent showers will continue tonight at the SLC
terminal, with CIGS falling below 7000ft near showers. There will be
a 30 percent chance of temporary MVFR conditions under the heavier
showers. Otherwise, northwesterly winds are expected to become
established after midnight.





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